Originally Posted by
BlazingPedals
After lying down for 80-100 miles, my back is no problem at all. What's this 'sore back' s**t, er, I mean stuff?
Just a guess, but if you have a sore lower back, there's one of two things going on. 1) you need more core exercises like sit-ups, or 2) you're riding with your back hunched.
Sounds like 1 and 2 both apply here.